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Golang语言并行设计的核心goroutine

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Golang语言字符串处理函数包strings,字符串类型转换包strconv。

 

/**

* Golang语言字符串处理函数包strings,字符串类型转换包strconv

*/

package main

 

import (

“fmt”

“strconv”

“strings”

)

 

func main() {

str := “This is an example of a string”

fmt.Printf(“Ture/False? Does the string \”%s\” have prefix %s?”, str, “Th”)

// 判断字符串的前缀

fmt.Printf(“%t\n”, strings.HasPrefix(str, “Th”))

fmt.Printf(“True/False? Does the string \”%s\” have suffix %s?”, str, “ing”)

// 判断字符串的后缀

fmt.Printf(“%t\n”, strings.HasSuffix(str, “ing”))

fmt.Printf(“True/False? Does the string \”%s\” have %s?”, str, “xa”)

// 判断字符串是否包含某字符

fmt.Printf(“%t\n”, strings.Contains(str, “xa”))

// 判断指定字符在字符串第一次出现的位置

fmt.Printf(“%d\n”, strings.Index(str, “s”))

// 判断指定字符在字符串最后一次出现的位置

fmt.Printf(“%d\n”, strings.LastIndex(str, “s”))

// 将字符串中的前n个字符替换,并返回一个新字符串,如果n=-1则替换所有字符串中的字符

fmt.Printf(“%s\n”, strings.Replace(str, “is”, “at”, 1))

// 统计指定字符在字符串中出现的次数

fmt.Printf(“%d\n”, strings.Count(str, “s”))

// 将字符串重复n次,并返回新字符串

fmt.Printf(“%s\n”, strings.Repeat(str, 2))

// 将字符串全部转换为小写字符

fmt.Printf(“%s\n”, strings.ToLower(str))

// 将字符串全部转换为大写字符

fmt.Printf(“%s\n”, strings.ToUpper(str))

// 去除字符串开头和结尾的空格

str1 := ” This is an example of a string ”

fmt.Printf(“%s\n”, strings.TrimSpace(str1))

// 去除字符串开头和结尾的指定字符,只去除字符串开头或结尾的指定字符

str2 := “my name is frank, this pencil is my”

fmt.Printf(“%s\n”, strings.Trim(str2, “my”))

fmt.Printf(“%s\n”, strings.TrimLeft(str2, “my”))

fmt.Printf(“%s\n”, strings.TrimRight(str2, “my”))

// 分割字符串,转换为一个slice

// 利用1个或多个空白字符来作为分隔符,将字符串分割成若干小块,并返回一个slice

// 如果字符串只包含空白字符串,则返回一个长度为0的slice

sli := strings.Fields(str)

for _, value := range sli {

fmt.Println(value)

}

str3 := “2019-05-07”

sli2 := strings.Split(str3, “-“)

for _, value := range sli2 {

fmt.Println(value)

}

// 拼接slice元素成为一个字符串

fmt.Printf(“%s\n”, strings.Join(sli2, “-“))

// 字符串类型转换

str4 := “123”

// 字符串类型转换为int

num, _ := strconv.Atoi(str4)

fmt.Printf(“%d\n”, num)

// int转换为字符串类型

newStr4 := strconv.Itoa(num)

fmt.Printf(“%s\n”, newStr4)

}

 

运行结果:

 

Ture/False? Does the string “This is an example of a string” have prefix Th?true

True/False? Does the string “This is an example of a string” have suffix ing?true

True/False? Does the string “This is an example of a string” have xa?true

3

24

That is an example of a string

3

This is an example of a stringThis is an example of a string

this is an example of a string

THIS IS AN EXAMPLE OF A STRING

This is an example of a string

name is frank, this pencil is

name is frank, this pencil is my

my name is frank, this pencil is

This

is

an

example

of

a

string

2019

05

07

2019-05-07

123

123

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